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# ansi-c++.m4 serial 1 (gettext-0.12)
dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
# Sets CXX to the name of a sufficiently ANSI C++ compliant compiler,
# or to ":" if none is found.
AC_DEFUN([gt_PROG_ANSI_CXX],
[
AC_CHECK_PROGS(CXX, $CCC g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC, :)
if test "$CXX" != ":"; then
dnl Use a modified version of AC_PROG_CXX_WORKS that does not exit
dnl upon failure.
AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
AC_LANG_PUSH(C++)
AC_ARG_VAR([CXX], [C++ compiler command])
AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])
echo 'int main () { return 0; }' > conftest.$ac_ext
if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
ac_cv_prog_cxx_works=yes
if (./conftest; exit) 2>/dev/null; then
ac_cv_prog_cxx_cross=no
else
ac_cv_prog_cxx_cross=yes
fi
else
ac_cv_prog_cxx_works=no
fi
rm -fr conftest*
AC_LANG_POP(C++)
AC_MSG_RESULT($ac_cv_prog_cxx_works)
if test $ac_cv_prog_cxx_works = no; then
CXX=:
else
dnl Test for namespaces. Both libasprintf and tests/lang-c++ need it.
dnl We don't bother supporting pre-ANSI-C++ compilers.
AC_MSG_CHECKING([whether the C++ compiler supports namespaces])
AC_LANG_PUSH(C++)
cat <<EOF > conftest.$ac_ext
#include <iostream>
namespace test { using namespace std; }
std::ostream* ptr;
int main () { return 0; }
EOF
if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
gt_cv_prog_cxx_namespaces=yes
else
gt_cv_prog_cxx_namespaces=no
fi
rm -fr conftest*
AC_LANG_POP(C++)
AC_MSG_RESULT($gt_cv_prog_cxx_namespaces)
if test $gt_cv_prog_cxx_namespaces = no; then
CXX=:
fi
fi
fi
])
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